FLU – it is obvious that you are an educated stickler when it comes to maintaining your vehicle(s). I am like you but to a much lesser degree. The most that I have done was to replace the fuel filter and brakes on my own vehicles.
I don’t know of any reputable shops that might be able to help you with your vehicle. My one piece of advice would be to consider selling your Audi/VW and purchasing a vehicle that requires less maintenance.
I’ve owned both German (Mercedes) and American (Ford) vehicles in my time and both required more repair than I was willing to tackle. After much thought I decided to go with a brand (Honda) that had a much better track record in terms of longevity, reliability, and resale value. Just my $0.02.
